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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'afe82a3243911de984eeb6317e9be6b35b1a3a8935971cc1faed3d5a1ea3a1e8' 
  AND token = '7w1sotiLmQEIyTT3WMZgAvWAFdAG78Rr3twvRX63SGs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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