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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c940e6d9059fa23d384aab6604a1d0addd5d7990cf39d23152939147999c8c6f' 
  AND token = 'OR+2HR4khBq5YCXTXwe4tYdNHC389/oRwI+I9w61/i8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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