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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4f876503b4273b58ad41651a2b70d2cb766319c9d06a324fdd2555a27d6302d' 
  AND token = 'zdGWj8W43c7qpwwmCMeynMAebeGDGaMXN2mIKJTfzbY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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