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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a14a6224901ccb2b33f9e78c5c83312350bbfb32e731936b5ae7a3ba53e64737' 
  AND token = 'pTLS7n91tEA/Z5ow5ebwNfwb6Mp039nLKbhbo8ppTTs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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