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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e34ebcfb9860cfabb110f3bda9eb89bdefe62deb8edfb2fad089c6fc66a8c52c' 
  AND token = 'RLZcfEUKx+UxB4aYQVUBpYQSX3S+1vrW4c17LFZILFA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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