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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f0791b1370f30e16526e4331f048c436822457d7ceb68d6b21233ac50c388ce' 
  AND token = 'HV1cqi8XTwg8pGdOt0YpASo67Aif/7IuB9qa/EflkCE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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