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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23605c0193268f9c17a2c39ba9168308f363b903b8a1a849894ff432f96feb98' 
  AND token = 'U0PFqn7uwu0TAP+FVXRTfFwVSX8ALgeb8zIlxBG/+DE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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