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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fde7297d1bedb1a4b8fd944d97e7745e0f12376f8979069b806801098ee3b341' 
  AND token = 'vHIIDuc7yoOnMRChFdxDjv6Ok7c8g1wZffjaes8Ogns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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