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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4715d2d55a6d88bcc45631a5c7179bd138c3b4210e99fd9ae0531e020a2a8af' 
  AND token = 'ERrzpKv3JEx+3RqOKqS0pcy6IcUfVcrBVO8uY9SUIiY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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