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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ce35554c5abb940dd7ae0a681d13b50a018df262d5818dba02144631ffbdcdb' 
  AND token = 'Lm0HJdk3IIiC73lZ+szbiq4Byve+OPYP45VrlUI9HGo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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