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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aadd6ac7c11697a1615a22a34b037226d0c3c1ff0bdb3ec03c7962773282c331' 
  AND token = 'qcGz1LpmRsWuI5Dho58of41cKCiIDoQtix2zwd4Kbxs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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