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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b2278b308a1c5a23947ea2ca15735f727064e1bbf9695c308525e9e8d3baf34' 
  AND token = 'Ai5LOxVdXFi8xkZf64HoVAc+l3no7VycT7h37GjI5zM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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