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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca2fa6594762f4c474c113938b3beb64a5ec47850556d5b894a87efa7ee69d72' 
  AND token = '+OvKW7CeQn1+rSNXogqtf278Jq2vNoMCtRouGS1Hb8U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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