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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a95ddf28fa7c584d63eacd65ec513c061313da808dff40c14e372f3ef0705a2' 
  AND token = 'iuw5pgofWTpMcH45OzuNIGQwTUox6nvFo/9naG059Ms=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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