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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56ffb1f52cbfb1dbea87790e5ae84aae77220399228d54a35bb4c28357b807b1' 
  AND token = 'sHSl/ivTwo+Gy5IKcOJm8m7CHjBrn4zxs70m+2Md68g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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