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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e14db2ddeb10bce6b3e4c56eac48a178c9112099c66c04a433dd6cc9714e67e9' 
  AND token = 'lhkiCpV8o45Ho6oGWhkITmBcTXADmLUQF9JCM4hl2EY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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