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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '436a57783c4a92103793a7fdf13d69d3df92f0d1c2fd30b4daf718181fdaffd0' 
  AND token = 'phDHkxKRqBjnYpaptm6r1evQ/EgyEydq90ABSsCf3S0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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