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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24b28c0385ca3631a6af93c44826770620c5ff9c1741571ae6866c611b3f32e7' 
  AND token = 'kN73CxEcXJ5wk8BiDvbeSnVeHYPYjRuiLemEdYYn2kA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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