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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f0cccb5a53fb33cc09192f66b214a8747b3e61dc44d3c0b9cfcbd1994439ea2' 
  AND token = '8yFlDB5pionP1Y6wRv3TABYTJ/1f2bUgkI4idkv3/kE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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