SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2f81f3a2193f99dbb70cfcf57d51c999d62f94006615085cf3037ac6b451cf3' 
  AND token = 'xR8HziqLPcQvgPUgfZYCM2QPvIfDZKyS+u9L4ojITeI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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