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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0bbc168cf826ff3dd2425bc4e30d1dc227f2d41122a0eb2556252dd972da6b8e' 
  AND token = 'gcuQuFfwyxA8VuIbnoEZ2n6vJKferuAh/vrdsGruDCw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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