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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b84a62c443bace823e005f923fa72ef39836c56eb10690b7860ac528e4f5beb6' 
  AND token = 'snNgAcLQRvW2XKGhDndvKma5OkjkhqWSDcowB4Y769c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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