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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6f61628550136739b88d7861fe9ab59d2a5877b92d38444a3c38e90a1b8dc8e' 
  AND token = 'bEfn7Ui5XZzuZ5xhM8wlVouR88ULx6YuFqZakqPBv08=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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