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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59d6fba25fa8cb84cbbed967c83ac7d7755e599e908291e8fc3ac34d72c84cfb' 
  AND token = 'DngMmpqeJL39xaPc4bepbGYerxf/oNJHakz7v69AXW8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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