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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '543a58cc8575604ec2ba9e978e16b0fe2856e0c6ed3867388ed0f00c854cfeb2' 
  AND token = 'mfJiDvW9WIOnRUc+XcAZNIyoMb7bg3a06lWzIa5ODqs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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