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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46ab06fb8d7a944f5aa485385e2d91cb5611b1cdeff7f230fa80c2d0d9a65e6e' 
  AND token = '1A5ZL4Yj5MioLfzRJDFrVUda7O0EET1GJb8h01/Dc8Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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