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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1723cd9394066f5573cf6ea3af364f6864b403c80e85a84825bf90e56a9d204f' 
  AND token = 'PpqUNEFU5Ens1NH97eiYvn3uqIRY1yOTS1z3BrFRJrA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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