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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e309273f5b244945612d24ae38167ab7a2974f97c5b184ce5c0a700b6b1fa815' 
  AND token = '9T3blX9suHCwrhd2lSpjGgp3Ul7XZ7qEkF3YMwNofck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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