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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6e5f8d3a1a23430e8dc0360cea6816525d68ed916ba9ed1ebbfbc993a35e1fa' 
  AND token = 'kfcGGnlj/pMsQdOeLxMHoDQoYqeUf7HIbhN9YPbmOdc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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