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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a116e2bc380a225193ea8ed5f2e9ff45ceef5272ab582912eea805c383182f8' 
  AND token = 'nwwJ6VHhx28s+NYLoXLzYjExuxQjPB9xQP6yXiX+T2A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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