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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18c40a8e77ece69d6b835710681bcce24c730dc74b601ac0ddbd77622e7e84d0' 
  AND token = 'AxIFFXmYUc84TJJ2Au3J3dnzcsNuc0ZFXIUrmo/jE6U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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