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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf6d705d840c025d172eb7e3845ef6b4891966e8b5bbd521a740a69979cb4f22' 
  AND token = '0d1UTcBSaz7QeDY1/l7O3vgotJ/H2wxcDWMs9dHeeeo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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