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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28ded82dc36553ca6a13fd7c09ede961e6e5c992d0dea47d5b243169cd2c8d2e' 
  AND token = 'n7E+l8+laauDlkjNIY+jC7LxLLJNPJBltYgbBV9NmYw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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