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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '992e3d9d9e60dcc2628a05bae8f5bbc3559dbdf8c3709d97d02bf16ab2ebd7df' 
  AND token = 'DN7YND+GxKoXMaoOLXM3Mo4Z9/u97iKSp+p/pAra4vw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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