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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '315f0f2712f0592dd52c5f8f9e6d6670e88b99e10f27e272b02a21ae513f1f36' 
  AND token = 'iCsEys5cGyTc4v07cn9jbFhO8XavlPO1eeDkMAiNZvA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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