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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1b9e1e454f753b98222d4636b7f8dff485223750fd77c1f6a2aa13375dfcc72' 
  AND token = 'l4sbkVFeO7bGsydHuDcNaLH8GLRoItWBhqjOGY2xANo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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