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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8e7060f361f3c32e87b45dad25787781686c641dabca6d26d6c3faf96365f2e' 
  AND token = 'srYYdGZ1h7giP5MGULdx9p0CZI8THQeaKEBs4bVMfI4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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