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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55d329e40fd287385671813f58da5218ccea1a1580ecb2c95505f1ebc8505425' 
  AND token = '7BQ9YO6hygMsTtwx1Q0Z0F8rnZ5hlntsqKjjW3InkCs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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