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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12bbe1274980be20e4c8bdd23e2447e89231e9efff7253811652843b197f9061' 
  AND token = '+9hC69wwbVxWbNJZH0LCdA5bRnJVQQYd/6YCqBU66fM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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