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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eae508d2a5d44df0395210f4c6b6f484e82483c2984d6a36b5bd0e2096fb0cf3' 
  AND token = '1A1iUmfik8oJspgGacN/nV3YTro/q0CqxFX3bvOm0S8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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