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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe1cbd61a28a807ae18f2ed9407a8c3f2c895f144c4e5adc67cf0fda72cd2120' 
  AND token = 'w9lLbUCvjpiwA5zUwF0kMW8WaYy/3vxx165y06Rf9KA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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