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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6955a936eaf74ca7b33b65b427b11e434c79a9cab3072220838569c50993cd3' 
  AND token = 'KaNfVa+aAX+2HUrSC03r2u3mgM8Q8a6Xx54IvnG5uPQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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