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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a64f14d8d4672da54c55a9e65b8112dc9ccecaf54da82678471c87d02d423d65' 
  AND token = '6558xTDVQDsFvD5ykCGVwAjV0lK5+v08kZrThjnnLhM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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