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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68a39a9a9f3cef018ac0bbed5aad86c742ccc8acdf7423123c247234e8e3e4f3' 
  AND token = 'K5zOWUFDdFq6uz8l2TyGbRBcIq3wu4ONs0+PSY2SRPw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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