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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76a6eb8f99c4568d2920c02da50dd9b3725fda850c6800517d698cc643b9afef' 
  AND token = 'rTPKO4Kn3S4FlcM59kpMiaXoMd9SW7lSKXWZ8x/8E20=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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