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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4717529c22ed49b012eab159c9a76c949443fc05d8ae892e4911f4d1c708035' 
  AND token = 'jpjufZHbjdXYu1v1AP6VYypFqHXOeGSYG1x8Foukp/A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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