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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26de954b5205fac3896b596b307a281e205ca5b00dd458fbc61a15a479355696' 
  AND token = 'Aecdm+54/KjGQyKhh7HdBX+HKgdcf53V62m+ZyukRsY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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