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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eafdc1b73e49b95ef0339b353faed275b2cba99c32735fa8ba0002718b22a864' 
  AND token = 'z63NoYaubEuGfM+Mtu/THyD+eGf5uefMIdGTO/ndP34=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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