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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51a039494e1f1db9bf89b8b4d54aefda11e18542119d0cd7c2f596fa0667f51d' 
  AND token = '/sMljFTCUGAtLEOX/MTaR7eNNefwRnp0owGQpWpr8xM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}