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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a32b88e48062bbde403a88afea6b42681f348c37cefe5fc7e4d23ca8435173c' 
  AND token = 'Qb/UnvQh9WXrLRYT/WHzsoWmm2FbLlzHMPf18V+Chl0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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