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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ba274a1a36acd91e46f534c31b0bef371f9815c80d25609ef0603d007279965' 
  AND token = 'X0lAkE6Kate3Peqw+rCA/+FgurixzSk2oeN1VKk0J80=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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