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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7462e051c2b05544f95b692449edb251a2a00d9fb13f55f9bd5cacad3053cbad' 
  AND token = 'bE61AE6RANtPuvnGShk4rp9eIpp084h6p3Pv1d4WBMo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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