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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e013966b74b2bdbe21702ba0252c0b5b5fb2fab00347590c1bf18b7db7b47e0d' 
  AND token = 'HZf/ki6RWyz3KhjW2N9gbOG5EfcRLPat0KWq4juocH4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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