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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd547400ae261e78deab0ce10eeb01207f49ba1028ab918577d93245ca0e56256' 
  AND token = 'I+J0o7FMF7ee7PoSSHMHULsfvq3us+w7pv/eqoW+iZ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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