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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b28cffe3e226669ca961910c209b16f4033851e4533e336b8892dabdede30e3' 
  AND token = 'mGH7YeOfirxpqLo5NcZQsB0ZcFzraj9Ez0Sl+N+Y3JM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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