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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '936479e709233a65ace5339042a6b08dc972883ce4505f7a7f9bee5df065d79e' 
  AND token = 'VgAvd4LE11naeqOVPlNKf9uAZUnGN3RbNaneUUYLs8A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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