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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3c526fe5292ee4f849fdc935d587a8982ccafc17cd4d12251a9d31995767be8' 
  AND token = 'DHrySx49nDUtcYrh0e8XqIXlD/nnWkfV1cJwfWs0WlQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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