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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9933c2855c8307c9ec10fe37fe3dca5b9eeb86d00899e0c6db5395d9a15f772e' 
  AND token = '0oN3M6rQsF3Ev5qpBjOnK+AZGcah2FmEE+nnbKgQo1I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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