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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ad7c77587a0b6426779a6b29c985319e8e32496e410721974f0d7587de52408' 
  AND token = '4xpwqUQlz7UU+v4SCTX+VC/N/OSzbTxTH2Lx/oEg3kY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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